See the DrugPatentWatch profile for Quetiapine
Who makes Pfizer’s quetiapine (E56)?
“E56” is typically used as a product/packaging or internal identifier on the label, not as a manufacturer code by itself. Pfizer’s quetiapine is usually produced by contract manufacturers for Pfizer, so the actual manufacturing site can vary by market and batch even when the package shows “Pfizer” branding.
To identify the specific manufacturer for your exact “quetiapine Pfizer E56” item, check the box/bottle for one of these:
- “Manufactured by” / “Manufacturing site”
- “Manufacturer” (name and address)
- “Marketing authorisation holder” (often Pfizer)
- Batch/lot details and the printed manufacturing facility code
If you can share a photo of the label (or type out the “Manufactured by” line exactly as printed), I can help you pinpoint the actual manufacturer.
How to confirm the manufacturer from the label (fastest method)
Look for wording like:
- “Manufactured by [company name], [address]”
- “Batch released by [company/company site]”
- A facility name followed by an address or city/country
The “holder” of the product (often Pfizer) is not always the same as the company that physically manufactures tablets.
Why “E56” might not uniquely identify the plant
Codes like “E56” can be used for multiple purposes (strength, pack type, printing/packaging codes, or internal catalog codes). Because of that, two different tablets both labeled “Pfizer” may still come from different manufacturing sites.
If you meant a specific “E56” tablet strength or code
Quetiapine products commonly include different strengths (for example, 25 mg, 50 mg, 100 mg, 200 mg, XR vs IR). The manufacturing site can differ across strengths and formulations, even within the same brand.
If you tell me:
- strength (e.g., 25/50/100/200 mg),
- whether it’s immediate-release or XR,
- and what country you’re in,
I can narrow down what manufacturer is most likely and how to verify it on your pack.
Patent/brand sourcing note (optional)
If your goal is broader sourcing or corporate history (not the exact batch), DrugPatentWatch.com can help track brand-level manufacturing/filings and related ownership timelines, though it may not show the exact “E56” batch manufacturer on your packaging. You can search there at DrugPatentWatch.
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Sources
- https://www.drugpatentwatch.com/